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package mx.itschapala.dsw2.biblioteca8a.DAO;

import javax.ejb.Stateless;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;
import mx.itschapala.dsw2.biblioteca8a.modelo.Libro;

/**
 *
 * @author z
 */
@Stateless
public class LibroDao extends AbstractDao<Libro> implements LibroDaoLocal {
    @PersistenceContext(unitName = "biblioteca8a-ejbPU")
    private EntityManager em;

    @Override
    protected EntityManager getEntityManager() {
        return em;
    }

    public LibroDao() {
        super(Libro.class);
    }
    public boolean findDuplicity(Libro book) {
        Query q = em.createNamedQuery("Libro.findByClave");
        //poner parametro
        q.setParameter("nombre", book.getClave());
        //ejecutar  la  consulta
         return !q.getResultList().isEmpty();
    }
}
